摘要
Seeking catalysts with high electrocatalytic activity for ambient-condition N2 reduction reaction (NRR) remains an ongoing challenge due to the chemical inertness of N2.Herein,defect-rich WS2 nanosheets (WS2-x) were designed as an efficient electrocatalyst for NRR,which were prepared via vulcanizing the oxygen-vacancy-rich tungsten oxide in a vacuum tube.The sulfur defects were conducive to the adsorption and activation of N2.In neutral electrolyte of 0.1 mol L^(-1)Na2SO_(4) at-0.60 V vs.reversible hydrogen electrode,such WS2-xoffered a high Faradaic efficiency of 12.1%with a NH3generation rate of 16.38μg h-1mg-1cat..
由于N2的化学惰性,实现高效的N2还原反应(NRR)亟需发展高活性的电催化剂.本文中,我们设计了富含缺陷的WS2纳米片(WS2-x)作为NRR的有效电催化剂,该催化剂是在合成具有氧空位的二维WO3纳米片的基础上通过真空封管法硫化方法制备而成.这种单层的WS2纳米片是由S-W-S夹心阵列组成的类石墨烯结构,具有高电子迁移率,中等带隙和丰富的活性位点,同时硫缺陷有利于N2的吸附和活化.在相对于可逆氢电极为-0.60 V的Na2S O_(4)(0.1 mol L^(-1))中性电解质中,使用该WS2-x催化剂可得到12.1%的法拉第效率和16.38μg h-1mg-1cat.的产氨量.
基金
supported by the National Natural Science Foundation of China (21874079)
the Natural Science Foundation for Outstanding Young Scientists of Shandong Province (ZR2018JL011)
the Key R&D Project of Shandong Province (GG201809230180)
Taishan Scholars Program of Shandong Province (tsqn201909088)
the Outstanding Youth Innovation Team of Universities in Shandong Province (2019KJA027)
the Science & Technology Fund Planning Project of Shandong Colleges and Universities (J16LA13 and J18KA112)。
